ok so ive been studying the band plan stuff and i thought i understood it but now im second guessing myself. i just upgraded from tech to general last month and im trying to figure out where i can actually transmit on 40 meters. like i know generals dont get the whole band but the chart in the handbook is kind of confusing to me, theres like phone and cw segments and then the voice portion seems different depending on whether youre in ITU region 1 or whatever.

also somebody on the repeater mentioned something about staying away from the band edges and i didnt really understand why. like if 40m phone starts at 7.175 for generals, can i just park right there at 7.175 or is that a bad idea for some reason? i dont want to step on anyone or cause problems, just trying to understand the etiquette i guess

yeah the band edge thing trips up a lot of new generals. basically your signal isnt a perfect single frequency, especially on SSB — your voice audio kind of spreads out a few kHz depending on how wide your filter is and how your radio is set up. so if you tune to exactly 7.175 your transmitted audio could actually be bleeding below that into the extra/advanced only portion. most people say stay at least 3 kHz inside the band edge to be safe, so something like 7.178 and up is a more comfortable starting point for phone.

as for the ITU region stuff dont worry too much about that for domestic operating, its mainly relevant if youre trying to work DX stations in europe or africa where their 40m allocations are different and sometimes narrower. you might hear stuff below 7.100 from DX stations that you cant legally transmit on yourself. just listen down there and work them when they call CQ up in your segment.

went through the exact same confusion when i upgraded honestly. what finally made it click for me was just pulling up the ARRL band plan PDF and cross referencing it with part 97. the FCC chart shows your actual legal limits and the ARRL band plan is more like gentlemans agreement stuff about where different modes tend to hang out. they're not the same thing and mixing them up in your head makes it way more complicated than it needs to be.

the band edge thing is real though, had a guy at a hamfest tell me he got a complaint once for apparently causing interference and it turned out his dial was right on the edge and his radio was apparently running a bit wide. never had a problem since he started staying a few kHz inside.